a body headers in a c body

I would say yes. We did a 71 "B" body with a 440, no problem.Should be fine in a "C" body.
I also asked Mike Schumacher if they would fit a Dodge full size pickup and that too is a yes. So A,B,C,D pickup and also E body too.
Also installed them in a 65 "B" body with a "B'' engine. Fit it too.